Piston.



No. 769,630. PATENTED SEPT. 6, 1904. D. W. PORTER.

PISTON.

APPLICATION FILED MAY 17, 1904.

NO MODEL.

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UNITED STATES Patented September 6, 1904.

PATENT OFFICE.

PISTON.

SPECIFICATION forming part of Letters Patent No. 769,630, dated September 6, 1904.

Application filed May 17, 1904;.

To a 'ur/mm, it nmy concern:

Be it known that .1, DAVID W. PORTER, a citizen of the United States of America, residing at Sewickley, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Pistons, of which the following a specification, reference being had therein to the accompanying drawings.

This invention has relation to pistons used in cylinders of steam or pumping engines; and the object of my invention is to provide a piston the packing-rings of which can be adjusted from the exterior of the cylinder-casing.

Another object of my invention is the provision of novel means carried by the piston and its appurtenant parts whereby the packing-rings of said piston may be expanded when the same become worn to lit the same as snugly as if said rings had not depreciated in size.

Heretofore and before my invention was put into practice the packing-rings when they have become worn have been adjusted from the interior of the cylinder, it being necessary to remove the head of the cylinder whereby this adjustment could be manipulated, and in my present construction I have entirely dispensed with the inconvenience caused by stopping the engine, allowing the cylinder to cool, and the removing of the cylinder-head.

The above construction will be hereinafter more fully described, and specifically pointed out in the claims, and, referring to the drawings accompanying this application, like numerals of reference indicate like parts throughout the several views, in whiclr- Figure l is a longitudinal sectional view of a cylinder constructed in accordance with my invention. Fig. 2 is a transverse sectional view taken on the line c 11' of Fig. 1. Fig. 3 is a side elevation of the piston -head, having mounted therein a plurality of the adjusting members. Fig. 4: is a front view of the same, and Fig. 5 is a detail perspective view of one of the adjusting members.

In the accompanying drawings, the reference-numeral 1 indicates a cylinder of the ordinary construction, which is provided on its one end with a stufiing-box 2 and upon its Serial N0- 208,334. (No model.)

other end carries a removable head-plate 3, which is secured to the cylinder-body by the bolt and nuts 4, and this head-plate 3 carries stufling-box 5, similar in construction to the stuffing-box 2, both of which are of a wellknown form.

The reference-numeral 6 indicates the piston-rod, which passes through both of the stulfing-boxes 2 and 5, and the outer end of the said rod is provided with a bore 7, the outer end of said bore being screw-threaded, as indicated at S, and in said bore is secured a rod 9, said rod carrying screw-threads 10 upon its outer end to engage the screw-threads 8 of the bore of the piston; also, to engage nuts 11, carried upon the outer end of the rod 9.

The bore 7 extends into the piston-rod 6 and near its other end is provided with an aperture 12, and the piston-rod adjacent to the end of the bore is provided with a slot 14: and through said slot and aperture 12 passes a key 15, this key securing upon the piston-rod a coneshaped washer 17, which is provided with an aperture 18 for the reception of the key 15. The piston-rod 6 is provided with screwthreads 19 and 20 upon each side of the coneshaped washer 17, and upon the screw-threads 19 are placed nuts 21, which secure the headplate 22 of the piston in position, this headplate being annular in form and is provided upon its one face with a plurality of segmentshaped projections 23, a slot 2% being provided between each projection and radiating toward the aperture 25, through which the piston-rod passes. and in each slot 2 is mounted the adjusting member 26, this member comprising a T-shaped piece of metal, the stem of which carries a beveled surface 27, while the head of said piece is formed on an are, as indicated at 28, said are corresponding to the periphery of the projections 23, whereby when said adjustable member is placcd in the slots 2st the sides of the head 28 will rest upon the periphery of the projections 23.

In Figs. 3 and I of the drawings I have shown three of these adjustable members in position; but in Fig. 2 of the drawings I have illustrated six of these adjustable members as comprising the adjustable feature of my invention, and I wish it to be understood that a greater or less number of these adjusting members could be used, depending upon the size of the piston. The beveled surfaces 27 of these adjustable members are adapted to lie in engagement with the inclined surface of the cone-shaped washer 17, which is keyed to the rod 9, and around the adjustable members 26 I provide a split band-ring 29, and surrounding this ring are a plurality of packing-rings 30, said rings being adapted to engage the sides of the cylinder 1 and form a tight connection therewith. These parts having been secured in position, I employ an annular plate 31,which is secured upon the threads 20 of the pistonrod, this annular plate firmly holding the adjustable members and the packing-rings in their normal position.

The manner of adjusting the packing-rii1gs carried by the piston is as follows: The reciprocating movement of the piston within the cylinder having caused the packing-rings to become worn, contracted, and of a smaller diameter than the interior of the cylinder, the nuts 11, carried by the outer end of the rod 9, are rotated, whereby the rod 9 will be drawn outwardly, carrying with it the key 15, which secures the cone-shaped washer 17 upon the piston-rod, the slot 14 of said piston-rod permitting the longitudinal adjustment of the cone-shaped washer 17 thereon, and, as heretofore stated, this washer impinging against the beveled surface 27 of the adjustable members, these members will be expanded outwardly, spreading the split ring and expanding the packing-rings until they snugly engage the sides of the cylinder 1, the head-plate 22 of the piston preventing inward movement of the adjusting members and causing the same to move outwardly when the cone-shaped washer 17 is compressed against the beveled surface 27 of said members.

It will be observed that by constructing the nuts upon the end of the rod that a monkeywrench or spanner-wrench may be placed thereon and the rod adjusted to expand the packing-rings of the piston.

What I claim is 1. A piston of the character described comprising a hollow piston-rod a cone-shaped washer adjustably mounted upon said pistonrod, a plurality of wedge-shaped members adapted to engage said washer, a plurality of packing-rings surrounding said members, and means extending through said rod for moving said washer, substantially as described.

2. In a cylinder, the combination with a piston having a bore formed therein, a rod mounted in said bore, a cone-shaped washer carried by said piston a plurality of wedgeshaped members surrounding said washer, a plurality of packing-rings surrounding said members and means for expanding said packing-rings from the exterior of the casing.

3. In a cylinder, the combination with a piston having a bore formed therein, a rod mounted in said bore, a head-plate carried by said piston, a plurality of wedge-shaped members mounted upon said head-plate, a coneshaped washer interposed between said members, a plurality of packing-rings surrounding said members, and means for expanding said rings from the exterior of the cylindercasing, substantially as described.

4:. In a cylinder, the combination with a piston having a bore formed therein, of a headplate mounted upon said piston, a plurality of wedge-shaped members mounted in said head, a cone shaped washer interposed between said members,a metallic band surrounding said members, a plurality of packing-rings carried by said band, and means for expanding said packing-rings from the exterior of the cylinder-casing, substantially as described.

5. In a cylinder, the combination with a piston having a bore formed therein, a headplate mounted upon said piston, a plurality of wedge-shaped members mounted in said head, a cone shaped washer interposed between said members, a split band surrounding said members, a plurality of packing-rings surrounding said band, and means carried by said piston-rod and operable from the exterior of the cylinder-casing for adjusting said members to expand said rings, substantially as described.

In testimony whereof I affix my signature in the presence of two witnesses.

DAVID w. PORTER.

Witnesses:

H. C. Evnn'r, E. E. POTTER. 

